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We present Atacama Large Millimeter/submillimeter Array (ALMA) and Karl G.Jansky Very Large Array (JVLA) observations of the massive infrared dark cloudNGC 6334S (also known as IRDC G350.56+0.44), located at the southwestern end ofthe NGC 6334 molecular cloud complex. The H$^{13}$CO$^{+}$ and the NH$_{2}$Dlines covered by the ALMA observations at a $\sim$3$^{\prime\prime}$ angularresolution ($\sim$0.02 pc) reveal that the spatially unresolved non-thermalmotions are predominantly subsonic and transonic, a condition analogous to thatfound in low-mass star-forming molecular clouds. The observed supersonicnon-thermal velocity dispersions in massive star forming regions, oftenreported in the literature, might be significantly biased by poor spatialresolutions that broaden the observed line widths due to unresolved motionswithin the telescope beam. Our 3~mm continuum image resolves 49 dense cores,whose masses range from 0.17 to 14 $M_{\odot}$. The majority of them areresolved with multiple velocity components. Our analyses of these gas velocitycomponents find an anti-correlation between the gas mass and the virialparameter. This implies that the more massive structures tend to be moregravitationally unstable. Finally, we find that the external pressure in theNGC 6334S cloud is important in confining these dense structures, and may playa role in the formation of dense cores, and subsequently, the embedded youngstars.

ALMA observations of NGC 6334S $-$ I: Forming massive stars and cluster in subsonic and transonic filamentary clouds